A qorporation



med Nov. '21; 1924 W PRELLWITZ UOUNTING FORc CQNGRETE BREAKERS INVENToR l ,//JIY tool with relatively little exertionon his Patented ne;Y e, 192s.

UNITEDA ,sraras` WILLIAM rnnnnwrrz, vor nnsron,l PENNSYLVAEA, AssrGNoR/'To INGERsoL'L- RAND competitor JERSEY Grrr, New JERSEY, A conrozaarronor Nawannsnr.,

ivroUN'rING ron coNcnE'rEfvBRnxnns.

Application mea November 21,1924@r serial No. 751,29.

To c/,ZZ whom zt may concern:

Be it known that I, ILLIAM PRELLWITZ, a citizen of the 'United States, a resident of" Easton, county ofNorthampton, and State or Pennsylvania, have invented a certain Mounting for Concrete Breakers, of whichV the following is a specification, accompanied vby drawings.

This invention relates to an apparatus for breaking concrete, asphalt pavement and the like and more particularly to mountings for fluid actuated concrete breakers of the hammer type. y y

One or the objects of the invention is to mount a concrete breaker in Va manner which will permit the operator to transportv the device easily and apply great Lforceto the art.

Another object of the invention is `to provide flexibility'in the mounting wherebyV the' tool though tending to center itselfmay be twisted and manipulated in substantially the same manner as concrete breakers which are adapted to be hand-held.

Other objects' of. the invention will be in vpart obvious and yin part pointed out iu the following descriptionl taken in conjunction with the accompanying drawings in which,

Figure l is a side elevation otra mounted concrete breaker constructed in accordance withV the practice of the invention, parts being in section to more clearly show the details of construction,

Figure 2 is a front view ,of the machine also partly in section. s 1

Referring to the drawings the concrete breaker comprises a pair of wheels A hav ing an axle B to which are attached a pair of rearwardly extending handles C supporting a pneumatic hammer D. Preferably the hammer D is located between the wheels A and the ends of the handles C so that by pressing down at the ends of the handles the hammer is Vforced down.v Any suitable form of steel may be inserted in the hammer D as Jfor instance the pointed drill or chisel E which is adapted to` .split off concrete in blocks as shown at'F.l In order to balance the pneumatic hammer D on the handles C, counter weights G may be provided supported forwardly of the axle B. Y If desired, the counter weights G may be supported by the bolts H which pass kon the handles'Clas with a crow bar.

through the clamps .l and the axle Bto fas .ten the handles ICl rigidly on theV axleB.Y

PATENT lorries- In practice, it is desirable to support the hammer D flexibly von the handles C fork the reasonthat the blocks as shown 'at F may y then be pried loose by manipulatingthe handles C either sidewise. or backward and forward. As shown at Figure 1f the steel E Y may bev used to pry the block F loose 'from the foundation by pushing'forward or backy this end'the hainmerD-'is' provide-d with` aV luniversal mounting onthehandles compris- 'ing a cross bar K rotatablyr supported in brackets L on either handle C' anda pivot bolt O passing through the cross bar K and 'Y through the head P of the hammer VD.

Swinging motion forwardly and backwardly is vpermitted' by rotation of the cross bar K in the brackets L and sidewise movementV4 is permitted bythe rotation of theV pivot bolt O. y

Meansare provided to hold the hammer` `D in a predetermined position so that the l Vchisel E may be directed at any desired point. vThe four springs Q, are providedfor this purposeand arey attached to a colf,

lar RA about the hammer D and to boltsr S held on the handles C by' means ofbrackets For a more positive control ofv thefham mer D there is provideda rod UV attached to the cylinder of the hammer D andextending rearwardly to the operators posi tion at the end-oit the handles'C. nThe op-Y erator may, by pushing or pulling at theV rod U,`place the point or the chisel E on any. point he desires. Motive fluid is supplied to the hammer D throughk a suitable hose V- provided lwith a throttle valve W near the handle Cv to provide a convenient control. The operation of the machine is clear from the above description, it being noted that the hammer D is transported about on the wheels A and placed approximately over the place where the concrete is to be broken. Thereafter the operator by manipulating the rod U swingsjthe chisel lil-*where he wishes to break ori" the piece ofconcrete V and then by opening the throttle'VS7 starts operating the` pneumatic hammer D. The

operator feedslthe chisel E into tliewvork- Vits foundation.

Adle C and using the chisel E somewhat as a crowbar is used to split o the blockv from The hammer D, however, is'notffree to swing about but is normally held invan-upright position by the springe Q. ln wheeling the machine about the weight of the hammer D is 'part-'ly' counterbalanced by the weights Gr which relieve the operator to a large extent.

I claim: y.

l. A Vconcrete breaker comprising a pair Aof wheels, an axlel for the wheels, a pair or rearwardly extending handles attached to the" axle, a pneumatic hammer mounted pivotally on the handles, and a drill steel in thehainmer to receive the blows of said hammer. f

V the axle, a vpneumatic hammer pivotally at# tached to the handles, a drill steel in the krearwardly extending handles attached to the axle, a pneumatic hammer, a drill steel extending into the hammer to receive the blows ofthe hammerand a universal mount` ing for -said hammer .onsaid handles.

il. A concrete breaker comprisngia pair oie wheels, an axle for the wheels, a pair of rearwardlyl extendingY handles attached to the axle, a pneumatic hammer, a drill steel` extending into the haminerto receive. the

blows oi tliehammer, a universal mountingfor said hammer on said handles, and springv means for holding vsaid hammer normally Vin a predetermined position. l

ln testimony whereof I' have signed this speciication.

WiLLrAM rRii'nLwiTZ. 

